A stabilizer for weighting pipes, deep drilling devices with stabilizers and a method for cutting free of a with stabilizers equipped deep drilling of a close fit for circulation

摘要

A rigid stabilizer sleeve having outwardly extending ribs is slidably received over a collar, internal clamp rings operate to clamp the stabilizer at any desired position on the drill collar; another aspect resides in a structure and method of operation enabling use of a washover tool upon seizure of the string by providing jaw clutch means on opposite ends of each stabilizer and an upwardly facing jaw clutch immediately above the bit so that the stabilizers can be cut by a washover tool to release the clamping means then moved down the string to the next lower stabilizer for engagement with the upper jaw clutch thereon to seize the released stabilizer and enable subsequent cutting through its remaining uncut length and similarly through the length of the other stabilizers until all stabilizers above the point at which the string has been seized have been cut through by the washover tool to enable the tool to clear the seized portion of the string.